Rack



FIG. 1 is a perspective view of a rack, showing my new design.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a left end view thereof.

FIG. 5 is a right end view thereof.

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings depict portions of a rack that form no part of the claimed design. 

CLAIM The ornamental design for a rack, as shown and as described. 